COMET T3118 – 4-20mA Indoor Temperature and Humidity Transmitter

COMET T3118 – 4-20mA Indoor Transmitter for Temperature -10 to +50 °C (±0.5 °C), Humidity 5–95 %RH (±2.5 %), Dew Point, for KU68 Boxes, IP20, LCD switchable 

The COMET T3118 is an elegant and precise 4-20mA indoor temperature and humidity transmitter – specially designed for installation in standard KU68 flush-mount boxes (switch/socket boxes). Ideal for modern building automation, HVAC systems, room climate control, offices, hotels, schools, hospitals or residential buildings, where discreet, flush-mounted yet highly accurate climate measurement is required. The transmitter fits perfectly into standard flush-mount boxes, making it an ideal alternative to conventional room climate sensors – with an analog 4-20mA output for direct connection to controllers, PLCs, BMS systems, or actuators.

The internal temperature sensor measures from -10 to +50 °C (±0.5 °C) and humidity from 5 to 95 %RH (±2.5 %RH). The dew point is automatically calculated (±1.6 °C at T<25 °C and RH>30 %). The large dual-line LCD displays current values and can be switched off if desired – ideal for representative rooms. The output is freely scalable – you define via PC the measuring range and which value (T, RH, or Dew Point) is output. The flat, stylish housing (88 x 106 x 33 mm) integrates harmoniously into any interior and is designed for indoor use only (IP20). Power supply 9-30 V DC – easily connected via existing HVAC power or central power supply.

The transmitter is maintenance-free, long-term stable, and available with a traceable calibration certificate (according to EN ISO/IEC 17025) – top quality for demanding indoor applications. The computer-assisted design ensures long-term stability and error indication. Installation takes only minutes: insert transmitter into KU68 box, connect wiring (power + 4-20mA), attach cover frame – done. No external probe required – everything in one device for maximum reliability and minimal error sources.

Why the COMET T3118 is the 4-20mA indoor transmitter:

• Perfect for KU68 flush-mount boxes – flush and discreet installation
• Freely scalable 4-20mA output – for controller and PLC inputs
• High precision – Temp. ±0.5 °C | Humidity ±2.5 %RH
• Switchable large dual-line LCD – current values visible or hidden
• Dew point integrated – automatic calculation
• IP20 and elegant design – ideal for representative interiors
• Wide power supply range – 9-30 V DC
• Long-term stability and maintenance-free – with calibration certificate
• 3-year warranty

Technical data T3118:

• Temperature measuring range: -10 to +50 °C (±0.5 °C)
• Humidity: 5 to 95 %RH (±2.5 %RH)
• Dew point: -60 to +80 °C (±1.6 °C at T<25 °C and RH>30 %)
• Resolution: 0.1 °C / 0.1 %RH
• Output: 4-20 mA
• Power supply: 9-30 V DC
• Operating temperature: -10 to +50 °C
• Protection class: IP20
• Dimensions: 88 x 106 x 33 mm
• Weight: approx. 150 g
• Warranty: 3 years

Perfectly suited for:

• Building automation and BMS systems
• Offices, hotels, and conference rooms
• Schools, kindergartens, and lecture halls
• Hospitals and care facilities
• Residential buildings and smart home applications
• 4-20mA connection to controllers and actuators
• Demand-based room climate control
• Integration into existing 4-20mA systems

Installation and commissioning – done in minutes

Insert the transmitter into the KU68 flush-mount box, connect power (9-30 V DC) and 4-20mA wiring, attach the cover frame – done! Configure the output via PC (COMET software) – select measuring range and output variable. No calibration effort required when replacing the device.

Summary:

• Humidity and temperature transmitter
• For indoor use
• For demanding applications in building energy management and HVAC systems
• Easy installation in standard KU68 flush-mount boxes for household sockets and switches

Scope of delivery:

• T3118
• User manual
• Traceable calibration certificate
• Free TSensor software for transmitter configuration